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• Using FFMPEG : How to do a Scene Change Detection ? with timecode ?

  24 novembre 2016, par Mozart

  Based on this article it seems that it is possible to use FFMPEG to detect scene change in videos :
  http://www.luckydinosaur.com/u/ffmpeg-scene-change-detector

  Now I have a video that displays a book text and when the text (word or sentence) is spoken it gets highlighted.
  Something like this audio book : https://youtu.be/lA7L6ZNVKjc

  I need to know the timestamp when the text gets highlighted (hence scene change), this will allow me to add timestamp tags on my youtube video, so it becomes easier for listeners to navigate through the audiobook.

  What is the magic command line that would do this ?

  Thank you very much !

• how to extract a metadata track from MP4 file

  6 mars 2016, par ravi

  I need to extract metadata track from a MP4 file and save as separate file. I see that, using ffmpeg I can extract standard tracks like Audio or Video or Subtitle track and save it as a new file. For ex : to save audio track I use the command below :

  ffmpeg -i input-video.avi -vn -acodec copy output-audio.aac

  But my need is to save a proprietary metadata track. Any pointers will be helpful.

  Here is output of ffmpeg to know different traks that are present in the file. Particuarly, I am interested in extracting track corresponding to Stream #0:3(eng)...

  C:\Users\rkumar\Documents\work\tools\ffmpeg\bin>ffmpeg.exe -i input.MP4
  
  ffmpeg version N-57176-g64b3aaf Copyright (c) 2000-2013 the FFmpeg developers
  
  built on Oct 15 2013 21:32:52 with gcc 4.8.1 (GCC)
  
  
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'input.MP4':
  
  Metadata:
  
  major_brand     : mp41
  
  minor_version   : 538120216
  
  compatible_brands: mp41
  
  creation_time   : 1970-01-01 00:00:09
  
  Duration: 00:00:10.52, start: 0.000000, bitrate: 834 kb/s
  
  
  
  Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuvj420p(pc, bt709), 
  
  854x480 [SAR 1:1 DAR 427:240], 679 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc (default)
  
  Metadata:
  
  creation_time   : 1970-01-01 00:00:09
  
  handler_name    : AVC
  
  timecode        : 00:00:13:22
  
  
  
  Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
  
  Metadata:
  
  creation_time   : 1970-01-01 00:00:09
  
  handler_name    : AAC
  
  timecode        : 00:00:13:22
  
  
  
  Stream #0:2(eng): Data: none (tmcd / 0x64636D74), 0 kb/s (default)
  
  Metadata:
  
  creation_time   : 1970-01-01 00:00:09
  
  handler_name    : TCD
  
  timecode        : 00:00:13:22
  
  
  
  Stream #0:3(eng): Data: none (ssmd / 0x646D7067), 5 kb/s (default)
  
  Metadata:
  
  creation_time   : 1970-01-01 00:00:09
  
  handler_name    : MET
  
  
  
  Stream #0:4(eng): Data: none (fdsc / 0x63736466), 10 kb/s (default)
  
  Metadata:
  
  creation_time   : 1970-01-01 00:00:09
  
  handler_name    : SOS

• FFmpeg trim .3gp and save as .mp4 not working

  11 avril 2016, par SebSob

  I am trying to trim a video input .3gp (http://www.sample-videos.com/video/3gp/144/big_buck_bunny_144p_2mb.3gp) and save it as .mp4, this is my command :

  ffmpeg -ss 00:00:00.000 -y -i input_vid.3gp -strict experimental -preset ultrafast -t 00:00:03.637 -r 30 -s 176x144 -ar 44100 -b:v 4000k -minrate 4000k -maxrate 4000k -c:a copy -vcodec mpeg4 output_vid.mp4

  But it gives me the following error :

  Setting 'pix_fmts' to value 'yuv420p'
  
  query_formats: 7 queried, 6 merged, 0 already done, 0 delayed
  
  w:176 h:144 fmt:yuv420p sar:12/11 -> w:176 h:144 fmt:yuv420p sar:12/11 flags:0x4
  
  Automatically choosing VBV buffer size of 232 kbyte
  
  intra_quant_bias = 0 inter_quant_bias = -64
  
  Could not find tag for codec amr_nb in stream #1, codec not currently supported in container
  
  Output #0, mp4, to 'output_vid.mp4':
  
    Metadata:
  
      major_brand     : 3gp4
  
      minor_version   : 512
  
      compatible_brands: isomiso23gp4
  
      encoder         : Lavf56.23.100
  
      Stream #0:0(und), 0, 1/15360: Video: mpeg4 ( [0][0][0] / 0x0020), yuv420p, 176x144 [SAR 12:11 DAR 4:3], q=2-31, 4000 kb/s, 30 fps, 15360 tbn, 30 tbc (default)
  
      Metadata:
  
        creation_time   : 1970-01-01 00:00:00
  
        handler_name    : VideoHandler
  
        encoder         : Lavc56.25.100 mpeg4
  
      Stream #0:1(und), 0, 1/8000: Audio: amr_nb (samr / 0x726D6173), 8000 Hz, mono, 12 kb/s (default)
  
      Metadata:
  
        creation_time   : 1970-01-01 00:00:00
  
        handler_name    : SoundHandler
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h263 (native) -> mpeg4 (native))
  
    Stream #0:1 -> #0:1 (copy)
  
  Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
  
  exit_program: 1 

  But it works fine if the input is an .mp4...

  Any idea’s ? Thanks